1.下载mysql.rpm包

# wget https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm

2.以管理员身份安装指定包（刚刚下载的）

# sudo yum instal   mysql80-community-release-el7-1.noarch.rpm

3.以管理员身份安装mysql-community-server

# sudo yum install mysql-community-server.x86_64

4.启动并配置mysql

sudo service mysqld start             //启动mysql
sudo systemctl enable mysqld          //配置开机启动

5.检索mysqld.log文件来查看默认密码

# grep 'temporary password' /var/log/mysqld.log

6.进入MySQL并修改密码（重要）

ALTER USER 'root'@'localhost' IDENTIFIED BY '这里填写新密码';